Flushing ATF - Do it yourself

[lenientism]

Over my anxiety to flushing ATF (Automatic Transmission Fluid), can we do it ourselves with assumption no powerflow of flushing machine available or ATF filter replacement.

Unscrew drain plug, drain out the old ATF. After couple minutes screw up the plug and start tipping up new 4 l ATF. Start the engine and try to shifting all gears couple times, preferable to drive it around for about 15 minutes, to make sure that transmission is now using new ATF.

Unscrew drain plug again, and drain out this new ATF. This step is to make sure that no old ATF at all left in the transmission system. Wait for some moments and fill up the transmission with new ATF. Now we drive using ATF perfectly new.

This will need ATF twice much, It is preferable to wait for 24 hours for each time ATF drained out before filling the new ones.

Is this common in practice?

[stevieturbo]

why would you need to wait 24 hours ?

And it will take a lot more than twice to change fluid that way. Yould need to do it about 4-5 times before you could be confident most of teh old fluid has been diluted down with new.

[lenientism]

Yeah it takes too long time I think.

I'll try another one adopting method of flushing radiator coolant. Unleash pipe out of ATF cooler, topping up the new ATF while engine is running. This sounds more practicable.

[stevieturbo]

lenientism said:

Yeah it takes too long time I think.

I'll try another one adopting method of flushing radiator coolant. Unleash pipe out of ATF cooler, topping up the new ATF while engine is running. This sounds more practicable.

Unless you go through all gears during the flush, that still wont yield a full flush I think.

[dugt]

at some point in the near future i will be hoping to change the auto box oil, its on a kt car that im building and the donor car hasnt moved for a while, but it still all works,

if i just drain out the old fluid and replace with new, will this not be enough?
ill be doing the change more for peace of mind and as ill have the box out it makes sence

doug

sorry i hijacked your thread

[stevieturbo]

dugt said:

at some point in the near future i will be hoping to change the auto box oil, its on a kt car that im building and the donor car hasnt moved for a while, but it still all works,

if i just drain out the old fluid and replace with new, will this not be enough?
ill be doing the change more for peace of mind and as ill have the box out it makes sence

doug

sorry i hijacked your thread

No, fluid remains in the torque covnertor and workings of the gearbox. It will take several drives and flushes for you to consider teh fluid all changed to new.

[dugt]

stevieturbo said:

dugt said:

at some point in the near future i will be hoping to change the auto box oil, its on a kt car that im building and the donor car hasnt moved for a while, but it still all works,

if i just drain out the old fluid and replace with new, will this not be enough?
ill be doing the change more for peace of mind and as ill have the box out it makes sence

doug

sorry i hijacked your thread

No, fluid remains in the torque covnertor and workings of the gearbox. It will take several drives and flushes for you to consider teh fluid all changed to new.

ok, is this process vitaly important? im guessing it is.
does this mean i need masses more fluid than the box holds?

my other problem being that i was planning on changing the fluid after ve got the box/engine out of the car, before i put it in the next car, which i would hope wouldnt take more than a few days, but it might take a while (maybe months worst case) to get engine running as i have no wiring loom/petrol pipes yet in the car


would i be better off chaning the fluid in the donor car, driving it backwards and forwards on the dirve, will this be enough, the car has got no mot/tax/insurance so cant go anywhere, if i jack it up and run it, would that work?

thanks
doug

[lenientism]

stevieturbo said:

lenientism said:

Yeah it takes too long time I think.

I'll try another one adopting method of flushing radiator coolant. Unleash pipe out of ATF cooler, topping up the new ATF while engine is running. This sounds more practicable.

Unless you go through all gears during the flush, that still wont yield a full flush I think.

ok points taken.

There is no need to wait for 24 hours, top up fluid while engine running and the old fluid comes out at radiator end. And there should be some drives on all gears before we drain it out again and topping up new fluid again.

[stevieturbo]

dugt said:

stevieturbo said:

dugt said:

at some point in the near future i will be hoping to change the auto box oil, its on a kt car that im building and the donor car hasnt moved for a while, but it still all works,

if i just drain out the old fluid and replace with new, will this not be enough?
ill be doing the change more for peace of mind and as ill have the box out it makes sence

doug

sorry i hijacked your thread

No, fluid remains in the torque covnertor and workings of the gearbox. It will take several drives and flushes for you to consider teh fluid all changed to new.

ok, is this process vitaly important? im guessing it is.
does this mean i need masses more fluid than the box holds?

my other problem being that i was planning on changing the fluid after ve got the box/engine out of the car, before i put it in the next car, which i would hope wouldnt take more than a few days, but it might take a while (maybe months worst case) to get engine running as i have no wiring loom/petrol pipes yet in the car


would i be better off chaning the fluid in the donor car, driving it backwards and forwards on the dirve, will this be enough, the car has got no mot/tax/insurance so cant go anywhere, if i jack it up and run it, would that work?

thanks
doug

I would think that if you are removing the box from the car, that would be the ideal time to change as much fluid as possible. You can drain the box and torque convertor that way while its out of the car, and also change any filters that might be inside the box.

All gears would never be engaged on the driveway unless somehow you can force it into the higher gears. Normally it will need to be driven to sufficient speed to engage all gears.